.\" $OpenBSD: EVP_PKEY_set1_RSA.3,v 1.16 2019/09/01 09:10:09 schwarze Exp $
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.Dd $Mdocdate: September 1 2019 $
.Dt EVP_PKEY_SET1_RSA 3
.Os
.Sh NAME
.Nm EVP_PKEY_set1_RSA ,
.Nm EVP_PKEY_set1_DSA ,
.Nm EVP_PKEY_set1_DH ,
.Nm EVP_PKEY_set1_EC_KEY ,
.Nm EVP_PKEY_get1_RSA ,
.Nm EVP_PKEY_get1_DSA ,
.Nm EVP_PKEY_get1_DH ,
.Nm EVP_PKEY_get1_EC_KEY ,
.Nm EVP_PKEY_get0_RSA ,
.Nm EVP_PKEY_get0_DSA ,
.Nm EVP_PKEY_get0_DH ,
.Nm EVP_PKEY_get0_EC_KEY ,
.Nm EVP_PKEY_get0_hmac ,
.Nm EVP_PKEY_get0 ,
.Nm EVP_PKEY_assign_RSA ,
.Nm EVP_PKEY_assign_DSA ,
.Nm EVP_PKEY_assign_DH ,
.Nm EVP_PKEY_assign_EC_KEY ,
.Nm EVP_PKEY_assign_GOST ,
.Nm EVP_PKEY_assign ,
.Nm EVP_PKEY_set_type ,
.Nm EVP_PKEY_base_id ,
.Nm EVP_PKEY_id ,
.Nm EVP_PKEY_type
.Nd EVP_PKEY assignment functions
.Sh SYNOPSIS
.In openssl/evp.h
.Ft int
.Fo EVP_PKEY_set1_RSA
.Fa "EVP_PKEY *pkey"
.Fa "RSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_DSA
.Fa "EVP_PKEY *pkey"
.Fa "DSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_DH
.Fa "EVP_PKEY *pkey"
.Fa "DH *key"
.Fc
.Ft int
.Fo EVP_PKEY_set1_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fa "EC_KEY *key"
.Fc
.Ft RSA *
.Fo EVP_PKEY_get1_RSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DSA *
.Fo EVP_PKEY_get1_DSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DH *
.Fo EVP_PKEY_get1_DH
.Fa "EVP_PKEY *pkey"
.Fc
.Ft EC_KEY *
.Fo EVP_PKEY_get1_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fc
.Ft RSA *
.Fo EVP_PKEY_get0_RSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DSA *
.Fo EVP_PKEY_get0_DSA
.Fa "EVP_PKEY *pkey"
.Fc
.Ft DH *
.Fo EVP_PKEY_get0_DH
.Fa "EVP_PKEY *pkey"
.Fc
.Ft EC_KEY *
.Fo EVP_PKEY_get0_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fc
.Ft const unsigned char *
.Fo EVP_PKEY_get0_hmac
.Fa "const EVP_PKEY *pkey"
.Fa "size_t *len"
.Fc
.Ft void *
.Fo EVP_PKEY_get0
.Fa "const EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_assign_RSA
.Fa "EVP_PKEY *pkey"
.Fa "RSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_DSA
.Fa "EVP_PKEY *pkey"
.Fa "DSA *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_DH
.Fa "EVP_PKEY *pkey"
.Fa "DH *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_EC_KEY
.Fa "EVP_PKEY *pkey"
.Fa "EC_KEY *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign_GOST
.Fa "EVP_PKEY *pkey"
.Fa "GOST_KEY *key"
.Fc
.Ft int
.Fo EVP_PKEY_assign
.Fa "EVP_PKEY *pkey"
.Fa "int type"
.Fa "void *key"
.Fc
.Ft int
.Fo EVP_PKEY_set_type
.Fa "EVP_PKEY *pkey"
.Fa "int type"
.Fc
.Ft int
.Fo EVP_PKEY_base_id
.Fa "EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_id
.Fa "EVP_PKEY *pkey"
.Fc
.Ft int
.Fo EVP_PKEY_type
.Fa "int type"
.Fc
.Sh DESCRIPTION
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
and
.Fn EVP_PKEY_set1_EC_KEY
set the key referenced by
.Fa pkey
to
.Fa key
and increment the reference count of
.Fa key
by 1 in case of success.
.Pp
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
.Fn EVP_PKEY_get1_DH ,
and
.Fn EVP_PKEY_get1_EC_KEY
return the key referenced in
.Fa pkey ,
incrementing its reference count by 1, or
.Dv NULL
if the key is not of the correct type.
.Pp
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
.Fn EVP_PKEY_get0_EC_KEY ,
and
.Fn EVP_PKEY_get0
are identical except that they do not increment the reference count.
Consequently, the returned key must not be freed by the caller.
.Pp
.Fn EVP_PKEY_get0_hmac
returns an internal pointer to the key referenced in
.Fa pkey
and sets
.Pf * Fa len
to its length in bytes.
The returned pointer must not be freed by the caller.
If
.Fa pkey
is not of the correct type,
.Dv NULL
is returned and the content of
.Pf * Fa len
becomes unspecified.
.Pp
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign_EC_KEY ,
.Fn EVP_PKEY_assign_GOST ,
and
.Fn EVP_PKEY_assign
also set the referenced key to
.Fa key ;
however these use the supplied
.Fa key
internally without incrementing its reference count, such that
.Fa key
will be freed when the parent
.Fa pkey
is freed.
If the
.Fa key
is of the wrong type, these functions report success even though
.Fa pkey
ends up in a corrupted state.
Even the functions explicitly containing the type in their name are
.Em not
type safe because they are implemented as macros.
The following types are supported:
.Dv EVP_PKEY_RSA ,
.Dv EVP_PKEY_DSA ,
.Dv EVP_PKEY_DH ,
.Dv EVP_PKEY_EC ,
and
.Dv EVP_PKEY_GOSTR01 .
.Pp
.Fn EVP_PKEY_set_type
frees the key referenced in
.Fa pkey ,
if any, and sets the key type of
.Fa pkey
to
.Fa type
without referencing a new key from
.Fa pkey
yet.
.Pp
.Fn EVP_PKEY_base_id
returns the type of
.Fa pkey .
For example, an RSA key will return
.Dv EVP_PKEY_RSA .
.Pp
.Fn EVP_PKEY_id
returns the actual OID associated with
.Fa pkey .
Historically keys using the same algorithm could use different OIDs.
For example, an RSA key could use the OIDs corresponding to the NIDs
.Dv NID_rsaEncryption
(equivalent to
.Dv EVP_PKEY_RSA )
or
.Dv NID_rsa
(equivalent to
.Dv EVP_PKEY_RSA2 ) .
The use of alternative non-standard OIDs is now rare, so
.Dv EVP_PKEY_RSA2
et al. are not often seen in practice.
.Pp
.Fn EVP_PKEY_type
returns the underlying type of the NID
.Fa type .
For example,
.Fn EVP_PKEY_type EVP_PKEY_RSA2
will return
.Dv EVP_PKEY_RSA .
.Pp
Most applications wishing to know a key type will simply call
.Fn EVP_PKEY_base_id
and will not care about the actual type,
which will be identical in almost all cases.
.Pp
In accordance with the OpenSSL naming convention, the key obtained from
or assigned to
.Fa pkey
using the
.Sy 1
functions must be freed as well as
.Fa pkey .
.Sh RETURN VALUES
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
.Fn EVP_PKEY_set1_EC_KEY ,
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign_EC_KEY ,
.Fn EVP_PKEY_assign_GOST ,
.Fn EVP_PKEY_assign ,
and
.Fn EVP_PKEY_set_type
return 1 for success or 0 for failure.
.Pp
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
.Fn EVP_PKEY_get1_DH ,
.Fn EVP_PKEY_get1_EC_KEY ,
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
.Fn EVP_PKEY_get0_EC_KEY ,
.Fn EVP_PKEY_get0_hmac ,
and
.Fn EVP_PKEY_get0
return the referenced key or
.Dv NULL
if an error occurred.
For
.Fn EVP_PKEY_get0 ,
the return value points to an
.Vt RSA ,
.Vt DSA ,
.Vt DH ,
.Vt EC_KEY ,
.Vt GOST_KEY ,
or
.Vt ASN1_OCTET_STRING
object depending on the type of
.Fa pkey .
.Pp
.Fn EVP_PKEY_base_id ,
.Fn EVP_PKEY_id ,
and
.Fn EVP_PKEY_type
return a key type or
.Dv NID_undef
(equivalently
.Dv EVP_PKEY_NONE )
on error.
.Sh SEE ALSO
.Xr DH_new 3 ,
.Xr DSA_new 3 ,
.Xr EC_KEY_new 3 ,
.Xr EVP_PKEY_get0_asn1 3 ,
.Xr EVP_PKEY_new 3 ,
.Xr RSA_new 3
.Sh HISTORY
.Fn EVP_PKEY_assign_RSA ,
.Fn EVP_PKEY_assign_DSA ,
.Fn EVP_PKEY_assign_DH ,
.Fn EVP_PKEY_assign ,
and
.Fn EVP_PKEY_type
first appeared in SSLeay 0.8.0 and have been available since
.Ox 2.4 .
.Pp
.Fn EVP_PKEY_set1_RSA ,
.Fn EVP_PKEY_set1_DSA ,
.Fn EVP_PKEY_set1_DH ,
.Fn EVP_PKEY_get1_RSA ,
.Fn EVP_PKEY_get1_DSA ,
and
.Fn EVP_PKEY_get1_DH
first appeared in OpenSSL 0.9.5 and have been available since
.Ox 2.7 .
.Pp
.Fn EVP_PKEY_set1_EC_KEY ,
.Fn EVP_PKEY_get1_EC_KEY ,
and
.Fn EVP_PKEY_assign_EC_KEY
first appeared in OpenSSL 0.9.8 and have been available since
.Ox 4.5 .
.Pp
.Fn EVP_PKEY_get0 ,
.Fn EVP_PKEY_set_type ,
.Fn EVP_PKEY_base_id ,
and
.Fn EVP_PKEY_id
first appeared in OpenSSL 1.0.0 and have been available since
.Ox 4.9 .
.Pp
.Fn EVP_PKEY_assign_GOST
first appeared in
.Ox 5.7 .
.Pp
.Fn EVP_PKEY_get0_RSA ,
.Fn EVP_PKEY_get0_DSA ,
.Fn EVP_PKEY_get0_DH ,
and
.Fn EVP_PKEY_get0_EC_KEY
first appeared in OpenSSL 1.1.0 and have been available since
.Ox 6.3 .
.Pp
.Fn EVP_PKEY_get0_hmac
first appeared in OpenSSL 1.1.0 and has been available since
.Ox 6.5 .
